JPH0626782B2 - Internal pipe inner polishing device - Google Patents

Description

The present invention relates to an inner surface polishing apparatus for an existing pipe such as a power generation boiler.

"Prior art" When a boiler tube for power generation is used for many years, scale adheres to the inner surface of the tube or the wall thickness is reduced. So I cut out a part of the thinned pipe and replace it with a new pipe. At that time, the worker finishes the end surface of the existing pipe, and an operator presses a grinder against the inner surface to which the scale is attached to polish it to a predetermined size, and then connects it to the new pipe by welding.

"Problems to be solved by the invention" Since the inner surface of a conventional boiler tube for power generation was manually polished, the inner surface of the tube could not be confirmed from the outside and the polishing operation was interrupted to confirm the polishing status. However, it is inevitable that polishing will be insufficient or over-polished, and variations in the polishing amount will be unavoidable. In addition, there are many tubes that can be replaced in power generation boilers, and in many cases they are arranged vertically.
The polishing work time is long, the operator is physically tired, and the work time depends on the skill of the worker.

[Means for Solving the Problems] Therefore, in view of the above circumstances, the present invention polishes the inner surface of the end so that the inner surface of the pipe can be accurately polished in a short time without being influenced by the skill of the worker. A clamp mechanism that holds the outer circumference of the end of the pipe with the pipe pedestal and clamp pieces, a grinder, a grinder holder that holds the grinder so that the grindstone of the grinder is located on the inner surface of the end of the pipe, and an input rotary shaft. The output rotary shaft is arranged in a crank shape, and the eccentricity between the input rotary shaft and the output rotary shaft can be adjusted, so that the grinder can polish the inner surface of the pipe. And the output rotating shaft is urged by the urging means in the direction away from the input rotating shaft to press the grinder's grindstone against the inner surface of the pipe, and the other end of the input rotating shaft and the base end side of the output rotating shaft are placed in the crankcase. The present invention provides an inner surface polishing apparatus for an existing pipe, which comprises a turning radius adjusting crank mechanism to be housed and a transmitting mechanism for transmitting the output of the turning radius adjusting crank mechanism to a grinder holder by making a circular motion similar to that of an output rotating shaft. Is.

"Working" Grasp the end of the existing pipe to be polished with the clamp mechanism, position the grinder's grindstone on the inner surface of the end of the pipe, and drive the turning radius adjusting crank mechanism to transfer power through the transmission mechanism. The grinder is circularly moved by transmitting it to the holder and the grindstone of the grinder is pressed against the inner surface of the pipe, and at the same time, compressed air is sent to the grinder to rotate the grindstone.

[Example] The present invention will be described in detail below based on an example shown in the accompanying drawings.

As shown in FIG. 1, the inner surface polishing apparatus for an existing pipe is provided with a clamp mechanism 5 for a pipe 4 composed of a pipe pedestal 2 and a clamp 3 on one side surface of the machine frame 1 and perpendicular to the central portion of the other side surface of the machine frame 1. Shaped support plate 6
6 is placed at a predetermined interval, a transmission mechanism 7 is provided between them, and a grinder holder 8 is vertically provided at the lower end of the transmission mechanism 7, and a grindstone 10 of a grinder 9 is attached to the grinder holder 8 to make the pipe 4
The grinder 9 is held so as to be positioned on the inner surface of the. A gear box 11, a speed reducer box 12 and a motor 13 are stacked in this order on the upper surface of the machine frame 1, and a turning radius adjusting crank mechanism 14 is interposed between the gear box 11 and the upper portion of the transmission mechanism 7. There is.

As shown in FIG. 1, the clamp mechanism 5 of the pipe 4 has a machine frame 1
A hole 21 through which a grindstone 10 of a grinder 9 passes is bored in the lower part of the machine, and a pipe pedestal 2 having support projections at both ends on one side of the lower end of the machine frame 1 has an outer diameter of a pipe 4 to be ground. It is detachably attached as a size according to the size of. The clamp 3 is attached above the pipe pedestal 2, and the pipe 4 is placed on the pipe pedestal 2 and the clamp handle 22 of the clamp 3 is pushed downward, so that the clamp piece 23 moves downward to grip the pipe 4. To do.
In order to surely grip the pipe 4, both supporting protrusions and the clamp piece 23 are arranged so that the circumference thereof is divided into three and the mounting angle of the support protrusion on the pipe holder 2 is 90 °.

Next, the turning radius adjusting crank mechanism 14 will be described with reference to FIGS. 2 and 3. Vertical axis of rotation of motor 13
The gear 26 at the lower end of 25 meshes with the large gear 28 at the upper end of the vertical intermediate shaft 27 to reduce the output of the motor 13, and the bevel gear 29 at the lower end of the intermediate shaft 27 is the horizontal input rotating shaft 30. The mesh power is transmitted to. The gear 26 and the large gear 28 are housed in the speed reducer box 12, and the bevel gear 29 and one end side of the input rotary shaft 30 are housed in the gear box 11, respectively. The turning radius adjusting crank mechanism 14 has the input rotating shaft 30 and the output rotating shaft 32,
The input rotary shaft 30 and the output rotary shaft 32 are arranged in a crank shape. Here, the crank shape means that the axis of the input rotary shaft 30 and the axis of the output rotary shaft 32 are on the same axis in a plan view in the illustrated state, that is, the axis of the output rotary shaft 32 is an extension of the axis of the input rotary shaft 30. The eccentric distance L, which is a vertical gap between the input rotary shaft 30 axis and the output rotary shaft 32 axis, can be set in a front view. The other end side of the input rotary shaft 30 and the base end side of the output rotary shaft 32 are housed in a crankcase 33. An adjustment shaft 34 is vertically fixed to the other end of the input rotation shaft 30, a biasing shaft 35 is vertically fixed to the base end of the output rotation shaft 32, and the adjustment shaft 34 is vertically arranged in the crankcase 33. Crankcase that is slidably housed and fixed in an appropriate position
33 Tighten with a fixing bolt 36 inserted from a long hole 41 formed in the side wall in the vertical direction, and the biasing shaft 35 is biased upward by a coil spring 39 and slidably provided on the crankcase 33 side wall. Mount the slide pin 38 inserted from the carved long hole 37.

Since this biasing shaft 35 is biased upward by the coil spring 39, the upper part is formed to have a large diameter and the lower part is formed to have a small diameter, and the coil spring 39 is externally fitted to the lower small diameter part, and the upper end of the coil spring 39 is formed as a step. The lower end is engaged with a seat plate 40 stretched on the lower surface of the crankcase 33. The lower end of the urging shaft 35 can be projected downward from the hole formed in the seat plate 40 when the coil spring 39 is compressed a large amount. Coil spring 39
Is applied to the output rotary shaft 32 in a direction away from the input rotary shaft 30.

The adjusting position of the adjusting shaft 34 sets the eccentric distance L according to the radius of the inner diameter of the tube 4 whose inner surface is to be polished. Output rotary shaft 32
The eccentric distance L between the input rotary shaft 30 and the input rotary shaft 30 is the radius of rotation of the grinder 9. Further, since the biasing force of the biasing shaft 35 depends on the compression amount of the coil spring 39, when the grindstone 10 of the glider 9 is strongly pressed against the inner surface of the tube 4, the biasing shaft 35 is moved downward so that the coil spring 39 is compressed significantly. And slide pin 38 is attached to biasing shaft 35. Although the present embodiment describes the example of the coil spring 39 as the urging means, the present invention is not limited to this, and an elastic body such as rubber or any other means may be used.

When the motor 13 is energized, the motor 13 drives and the rotating shaft 25
Is rotated, the power is transmitted from the gear 26 to the large gear 28, is reduced to the intermediate shaft 27, and the power is transmitted.
31 is transmitted to the input rotary shaft 30, the crankcase 33 rotates about the input rotary shaft 30, and the output rotary shaft 32 is the input rotary shaft.
A circular motion centered around 30.

The output rotary shaft 32 makes a circular motion around the input rotary shaft 30, and the circular motion is transmitted via the transmission mechanism 7 to the grinder holder 8
When the grindstone 10 is pressed against the inner surface of the pipe 4 at the same time as the grindstone 10 is pressed against the inner surface of the tube 4 and compressed air is supplied to the grinder 9, the grindstone 10 is rotated and the grindstone 10 is rotated. To polish.

Regarding the mechanism in which the circular motion of the output rotary shaft 32 is transmitted to the grindstone 10 of the grinder 9, FIG. 1, FIG. 2, FIG. 3 and FIG.
It will be described with reference to the drawings. The crankcase 33 rotates around the input rotary shaft 30. Then, the output rotary shaft 32 becomes eccentric distance L
The rotation radius is. The circular movement of the output rotary shaft 32 transmits the circular movement to the grinder holder 8 via the transmission mechanism 7.

The transmission mechanism 7 has a transmission body 47 that holds the output rotary shaft 32 via a radial ball bearing 46. From the transmission body 47, two vertical sliding shafts 48, 48 are hung, and the vertical sliding shaft 48.・
There is a vertical slide 50 that slidably holds 48 via thrust bearings 49/49. The grinder holder 8 is fixed to the lower end of the vertical sliding shaft 48. Horizontally sliding horizontal slide shafts 51, 51 are vertically mounted on the support plates 6, 6, and
A horizontal slide 52 is slidably provided at 51 through a thrust bearing. The horizontal slide 52 and the vertical slide 50 are fixed and integrated to form a slide 53. The grinder holder 8 holds a grinder 9 having a grindstone 10 at its axial center.

Here, when the motor 13 is energized and the output rotary shaft 32 rotates about the input rotary shaft 30, the transmitter 47 moves the output rotary shaft 32.
However, the transmission body 47 has two vertical sliding shafts 48, 48 slidably mounted on the vertical slide 50 of the slide 53, and the vertical slide 50 is a horizontal slide 52. Since the horizontal slide 52 is slidably provided on the horizontal sliding shaft 51, 51 which is horizontally mounted between the stationary support plates 6 and 6, the output rotary shaft 32 is shown in the figure. Although the transmitter 47 rotates according to the locus circle of, the transmitter 47 moves according to the locus of the output rotation shaft 32 in that posture. Transmitter 47
The vertical slide shafts 48 and 48 are guided by the vertical slides 50 in the vertical direction, and the horizontal slides 52 are the horizontal slide shafts 51 in the horizontal direction.
・ Take 51 to move laterally. Therefore, the grinder holder 8 fixed to the lower ends of the vertical sliding shafts 48 and 48 makes the same circular motion as the output rotary shaft 32, and the grindstone of the grinder 9 is moved.
10 makes a similar circular motion.

Next, a mechanism in which the grindstone 10 of the grinder 9 is constantly pressed against the inner wall of the tube 4 will be described with reference to FIG.

FIG. 5 is a view similar to FIG. 4, in which the grindstone 10 is piped through the output rotary shaft 32 of the coil spring 39 when the crankcase 33 makes one rotation around the input rotary shaft 30 and the output rotary shaft 32.
It shows a state of being pressed against the inner surface.

FIG. 5A shows the state in which the crankcase 33 is vertical and the output rotary shaft 32 is located directly above the input rotary shaft 30, and the grindstone 10 is in contact with the upper portion of the inner surface of the pipe 4 in the state shown in FIG. Is. In this case, the output rotary shaft 32 is biased upward by the coil spring 39 in the direction away from the input rotary shaft 30, so that the grindstone 10 is pressed upward via the transmission mechanism 7.

FIG. 5B shows a state in which the crankcase 33 has been rotated rightward by 90 ° from FIG. 5A, the grindstone 10 is also in contact with the right side of the inner surface of the tube 4, and the output rotary shaft 32 is rotated rightward by the coil spring 39. The grindstone 10 is also urged to the right via the transmission mechanism 7.

In FIG. 5C, the grindstone 10 is in contact with the bottom of the inner surface of the pipe 4 with the crankcase 33 further rotated 90 ° to the right, and the output rotary shaft 32 is attached downward by the coil spring 39 in the crankcase 33. Transmission mechanism 7 because it is energized
The grindstone 10 is also pressed downward via.

In FIG. 5D, the crankcase 33 further rotates 90 ° and the rotation output shaft 32 is located on the left side of the input rotation shaft 30,
The grindstone 10 is also in contact with the left side of the inner surface of the tube 4. Crankcase
In the shaft 33, the rotary output shaft 32 is biased leftward by the coil spring 39, and the grindstone 10 is pressed leftward via the transmission mechanism 7.

As described above, the grindstone 10 is pressed against the inner surface of the pipe 4 in the normal direction at any rotation angle of the crankcase 33.

In the tube inner surface polishing device, the polishing machine is driven and the grinder is rotated continuously by connecting to the control box, setting the time with the timer, and pressing the start button, so that constant polishing can be performed.

"Effect of the invention" Since the conventional inner surface of the existing pipe was manually polished, the polishing condition of the inner surface of the pipe could not be confirmed from the outside and the polishing process must be interrupted to confirm the polishing condition. Insufficient or over-polishing makes it difficult to avoid variations in the amount of polishing, and the conventional variation in the amount of polishing was about 0.2 to 0.3 mm.However, according to the present invention, the variation in the amount of polishing is 0.1 mm or less and the inner surface of the pipe is polished accurately. Can be done. Further, according to the present invention, the working time can be reduced by 34%. Further, according to the present invention, it is possible to work in a narrow space where the existing pipe is installed. In addition, the inner surface of the pipe can be polished regardless of the skill of the worker.

BRIEF DESCRIPTION OF THE DRAWINGS The drawings are specific examples of the present invention. FIG. 1 is a perspective view showing an outline of the whole, FIG. 2 is a perspective view of a turning radius adjusting crank mechanism of a main part, and FIG. FIG. 4 is a perspective view of a turning radius adjusting crank mechanism, FIG. 4 is a front view illustrating a transmission mechanism for transmitting the power of the turning radius adjusting crank mechanism to a grinder, and FIG.
The figure is a front view for explaining a mechanism for pressing the grindstone against the inner surface of the tube. 4 …… Tube 5 …… Clamp mechanism 9 …… Grinder 10 …… Grindstone 8 …… Grinder holder 30 …… Input rotary shaft 32 …… Output rotary shaft L …… Eccentricity 14 …… Turning radius adjustment crank mechanism 7 …… Transmission mechanism

Claims (1)

[Claims] 1. A clamp mechanism for gripping an outer periphery of an end of a pipe whose inner surface is ground by a pipe pedestal and a clamp piece, a grinder, and a grinder's grindstone so as to be located on the inner surface of the end of the pipe. The grinder holder that holds the grinder and the input rotary shaft and the output rotary shaft are arranged in a crank shape, and the eccentricity between the input rotary shaft and the output rotary shaft can be adjusted to allow the grinder to polish the inner surface of the pipe. To give a circular motion by adjusting the radius of rotation according to the above, and urge the output rotary shaft in a direction away from the input rotary shaft by a biasing means to press the grinder's grindstone against the inner surface of the pipe, and the other end of the input rotary shaft. Also, the base end side of the output rotating shaft is a turning radius adjusting crank mechanism housed in a crankcase, and the output of the turning radius adjusting crank mechanism is caused to make a circular motion similar to that of the output rotating shaft so that the grinder ho The inner surface polishing apparatus become more existing pipe a transmission mechanism for transmitting the loaders.